Zircon U-Pb Age Of Granite In Chaganmulun Of Balinyouqi Of Inner Mongolia

The GreatXing’an Range in NE China is characterized by the widespreadMesozoic volcanic rocks.For the volcanic rocks in the northen segment,large numberof geochronological studies has been done,but for the the middle and southensegments, systematic geochronological study is still absent,which hampers futurestuding of the geological and tectonic evolution history of the GreatXing’an Range.Asystematic geochronological study will be done focusing on the volcanic rocks inChifeng of the middle and southern GreatXing’an Range.Meanwhile,combined withthe geochemistry in order to determine the magma sources and the petrogenesis of thevolcanic rocks.Importantly,here I futher discussed the tectonic controlling factors andgeodynamic nature of igneous events.This artical based on the1:50000survey of Geology and Mineral Resources ofBalinyouqi area in Chifeng City, Inner Mongolia Autonomous Region. Through theusing of field investigation, geological, geophysical, geochemical and remote sensingintegrated results data, we present new zircon U-Pb age date of granites using laserablation ICP-Ms technique and we did a experiment about the whole rock,sgeochemical analysis of the two types of granite. On this basis, we carried out thestudy on petrogenesis,magmatic evolution and diagenetic tectonic dynamics:1、The two rocks,ages are137Ma and136Ma.Both were output by small rockmass and intruded into the sedimentary strata of the Upper Permian Linxi group, Andwith the Upper Jurassic Mani Group,s volcanic rocks constitute the volcanic-intrusiverocks,portfolio.2、After the analysis of geochemical elements,both of the granites belong tohigh-K calc-alkaline series,the CG02is on the boundry of the high-K calc-alkalineseries and calc-alkaline series. Comprehensive trace element and REE analysis,both of the two rocks are fomed by the crust-mantle through the mixed melting in asqueezed environment.3、By reference in the study area and adjacent areas of geochronology dataanalysis,the major momentum causes of the granite formation of the district are bythe contorl of the Pacific plate subduction and the result of later Lithosphericextension and thinning。Meanwhile,the Pacific plate in late Mesozoic phase of thenorthward movement of the Asian plate magmatism in the region and diageneticsituation have an impact on it. But both of them post-extrusion stress are relativelyweakened, resulting in upwelling of mantle material, Underplating the lower crust,Rock partial melting and be formated。...